Applications

Gas Treatment on Ammonia Fertilizers

Application for washing polluted air with one or several gases with also an important contain of particles. The equipments used in this case are a combination of venturi-cyclon system followed with one or two stages of chemical scrubbers, used to remove dust, NH3 and HF generated in DAP, MAP and urea production

Among these arethe family of ammonium phosphate based fertilizer such asMAPandDAP.To meet the demandfor this type ofproducts are used manufacturing facilities, wherethe main processisthe digestion ofphosphate rockusing a combination ofHNO3, H2SO4and/orH3PO4andwith the addition ofNH3during the process.

Gas treatment:

Main areas of gas emission are the reactor andthe granulator.ThemainpollutantsareNH3,VOC'sand dust.The solution adoptedconsists ofan initial stage ofventuri-cyclon for dust removal,followed by anacidic scrubberto removeNH3anda final alkaline scrubber stepto remove HF(if present).Alsoin the caseof DAP,due to the strongpresence ofNH3, it is removed by therecirculation of aH3PO4solution to obtain(NH4)3PO4which, oncecrystallized,can be used asfertilizer.